src/ceph/src/librbd/mirror/GetInfoRequest.h

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3
   4 #ifndef CEPH_LIBRBD_MIRROR_GET_INFO_REQUEST_H
   5 #define CEPH_LIBRBD_MIRROR_GET_INFO_REQUEST_H
   6
   7 #include "include/buffer.h"
   8 #include "librbd/mirror/Types.h"
   9 #include <string>
  10
  11 struct Context;
  12 namespace cls { namespace rbd { struct MirrorImage; } }
  13
  14 namespace librbd {
  15
  16 struct ImageCtx;
  17
  18 namespace mirror {
  19
  20 template <typename ImageCtxT = librbd::ImageCtx>
  21 class GetInfoRequest {
  22 public:
  23   static GetInfoRequest *create(ImageCtxT &image_ctx,
  24                                 cls::rbd::MirrorImage *mirror_image,
  25                                 PromotionState *promotion_state,
  26                                 Context *on_finish) {
  27     return new GetInfoRequest(image_ctx, mirror_image, promotion_state,
  28                               on_finish);
  29   }
  30
  31   GetInfoRequest(ImageCtxT &image_ctx, cls::rbd::MirrorImage *mirror_image,
  32                  PromotionState *promotion_state, Context *on_finish)
  33     : m_image_ctx(image_ctx), m_mirror_image(mirror_image),
  34       m_promotion_state(promotion_state), m_on_finish(on_finish) {
  35   }
  36
  37   void send();
  38
  39 private:
  40   /**
  41    * @verbatim
  42    *
  43    * <start>
  44    *    |
  45    *    v
  46    * REFRESH
  47    *    |
  48    *    v
  49    * GET_MIRROR_IMAGE
  50    *    |
  51    *    v
  52    * GET_TAG_OWNER
  53    *    |
  54    *    v
  55    * <finish>
  56    *
  57    * @endverbatim
  58    */
  59
  60   ImageCtxT &m_image_ctx;
  61   cls::rbd::MirrorImage *m_mirror_image;
  62   PromotionState *m_promotion_state;
  63   Context *m_on_finish;
  64
  65   bufferlist m_out_bl;
  66   std::string m_mirror_uuid;
  67
  68   void refresh_image();
  69   void handle_refresh_image(int r);
  70
  71   void get_mirror_image();
  72   void handle_get_mirror_image(int r);
  73
  74   void get_tag_owner();
  75   void handle_get_tag_owner(int r);
  76
  77   void finish(int r);
  78
  79 };
  80
  81 } // namespace mirror
  82 } // namespace librbd
  83
  84 extern template class librbd::mirror::GetInfoRequest<librbd::ImageCtx>;
  85
  86 #endif // CEPH_LIBRBD_MIRROR_GET_INFO_REQUEST_H
  87